TYPO3 Core

Hello Core-Team,

I have created a new driver with basePath=/
In such a driver no preview images will be created

I found following in LocalDriver:

// as for the "virtual storage" for backwards-compatibility, this check always fails, as the file probably lies under PATH_site
// thus, it is not checked here
// @ todo is check in storage
if (GeneralUtility::isFirstPartOfStr($localFilePath, $this->absoluteBasePath) && $this->storageUid > 0) {
    throw new \InvalidArgumentException('Cannot add a file that is already part of this storage.', 1314778269);
}

I don't understand this part. Why?

Stefan